My optical shop is next to the laundry en my house. I used to heat laps
for warm pressing by holdig them under the hot water tap until they
softened. However the not water system is on a controled supply and
with my wife doing the washing of a morning the hot water is all used
up. I sometimes have to boil a jug of water. I find this inconvenient.
So I made a lap heater using a heat lamp. This is illustrated below.
It has one advantage in that I don t burn my hand as when holding the
lap under a hot water tap.